package ooday01;

public class ConsDemo {
    public static void main(String[] args) {
        Student zs=new Student();
        Student ls=new Student("李四",55);
        Student ww=new Student("王五",43,"jsd2302","1234");
        zs.sayHi();
        ls.sayHi();
        ww.sayHi();
    }
}
